Of an unknown compound containing only carbon and hydrogen, 0.123 moles was found to stoichiometrically react with 0.246 moles of hydrogen gas.Based on these data, we know that the unknown compound must be

Question

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The unknown compound reacts with hydrogen gas in a 1:2 ratio, indicating it adds two moles of hydrogen per mole of compound. This suggests the compound has double or triple bonds, characteristic of alkenes or alkynes, which can undergo addition reactions with hydrogen (hydrogenation) to become saturated. Alkanes are already saturated and would not react with hydrogen under normal conditions.

Of an Unknown Compound Containing Only Carbon and Hydrogen, 0